Remove libbacktrace definition of gettid.
Also simplifies the Darwin implementation of gettid, because
apparently libbacktrace had a better way of doing it.
Bug: 19517541
(cherry picked from commit 23f750b068ddf5b20fb5d153a798b22562368992)
Change-Id: I2f888e8ed7a2f5719973786cbcbb399a81867ee9
diff --git a/libbacktrace/backtrace_test.cpp b/libbacktrace/backtrace_test.cpp
index ba3cbb5..a086547 100644
--- a/libbacktrace/backtrace_test.cpp
+++ b/libbacktrace/backtrace_test.cpp
@@ -30,20 +30,21 @@
#include <time.h>
#include <unistd.h>
-#include <backtrace/Backtrace.h>
-#include <backtrace/BacktraceMap.h>
-
-// For the THREAD_SIGNAL definition.
-#include "BacktraceCurrent.h"
-
-#include <cutils/atomic.h>
-#include <gtest/gtest.h>
-
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
+#include <backtrace/Backtrace.h>
+#include <backtrace/BacktraceMap.h>
+
+#include <cutils/atomic.h>
+#include <cutils/threads.h>
+
+#include <gtest/gtest.h>
+
+// For the THREAD_SIGNAL definition.
+#include "BacktraceCurrent.h"
#include "thread_utils.h"
// Number of microseconds per milliseconds.